The invention belongs to the field of steel metallurgy, and in particular relates to a production method for preventing the surface of a medium-carbon manganese steel casting blank from longitudinally cracking, and solves the technical problem to provide a production method for preventing the surface of the medium-carbon manganese steel casting blank from longitudinally cracking. The production method comprises the following steps: A, converting and smelting the casting blank by a conventional method, alloying the smelted casting blank, and controlling the carbon content to between 0.25 and 0.40 percent and the manganese content to between 1.25 and 1.75 percent; B, after alloying, adding aluminum into molten steel to carry out final deoxidation; and C, continuously casting the molten steel to obtain medium-carbon manganese steel; and the production method is characterized by adding titanium-iron alloy after the final deoxidation in step B, controlling the titanium content to between 0.005 and 0.0145, and continuously casting the molten steel after the titanium-iron alloy is added. Through the improvement, the method achieves the aim of avoiding the surface longitudinal cracking defect of continuous casting blank of the medium-carbon manganese steel.